from __future__ import division, print_function
from sys import stdin
from math import hypot, sqrt
x1, y1, x2, y2 = (float(s) for s in stdin.readline().split())
print('{:.4f}'.format(hypot(x1-x2, y1-y2))) from __future__ import division, print_function from sys import stdin from math import hypot, sqrt float(s) for s in stdin.readline().split() for s in stdin.readline().split() s stdin.readline().split() stdin.readline().split stdin.readline() stdin.readline stdin readline split for s in stdin.readline().split() float(s) float s x1, y1, x2, y2 = (float(s) for s in stdin.readline().split()) x1 (float(s) for s in stdin.readline().split()) y1 x2 y2 print('{:.4f}'.format(hypot(x1-x2, y1-y2))) print '{:.4f}'.format(hypot(x1-x2, y1-y2)) '{:.4f}'.format '{:.4f}' format hypot(x1-x2, y1-y2) hypot x1-x2 x1 x2 y1-y2 y1 y2 x1, y1, x2, y2 = (float(s) for s in stdin.readline().split()) (float(s) for s in stdin.readline().split()) x1 y2 = (float(s) for s in stdin.readline().split()) (float(s) for s in stdin.readline().split()) y2 y1, x2, y2 = (float(s) for s in stdin.readline().split()) (float(s) for s in stdin.readline().split()) y1 x2, y2 = (float(s) for s in stdin.readline().split()) (float(s) for s in stdin.readline().split()) x2
from __future__ import division, print_function
from sys import stdin
from math import hypot, sqrt
x1, y1, x2, y2 = (float(s) for s in stdin.readline().split())
print('{:.4f}'.format(hypot(x1-x2, y1-y2)))